The new images are of a mountain lion known as P-19 and her nearly grown kittens, P-32 and P-33. Another sibling has appeared to have left.
A park ranger says kittens normally stay with their mother until they are about one or one-and-a-half years old.
The pictures were taken a couple of weeks ago at the western end of the Santa Monica Mountains, near the Los Angeles-Ventura County line.
The Santa Monica Conservancy has been tracking mountain lions since 2002. This is P-19's second litter.